Conviction is worthless unless it is converted into conduct.
Thomas Carlyle
A man cannot make a pair of shoes rightly unless he do it in a devout manner.
Men do less than they ought, unless they do all that they can.
People rarely succeed unless they have fun in what they are doing.
Dale Carnegie
You never achieve success unless you like what you are doing.
I swear my car won't run unless I'm picking my nose: At least, I'm that superstitious about it, so I don't want to take any chances.
Adam Carolla
There is no way in my right mind I would contemplate running 26 miles-plus unless it involved a chase with Pamela Anderson.
Jasper Carrott
Unless both sides win, no agreement can be permanent.
Jimmy Carter
I can't write unless I'm overlooking water.
Mark Carwardine
No one leaves an old friend unless they are ashamed.
Julian Casablancas